[clang-tools-extra] Support renaming designated initializers (PR #86976)

[via cfe-commits]

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@@ -367,6 +367,25 @@ class RenamerClangTidyVisitor
     return true;
   }
 
+  bool VisitDesignatedInitExpr(DesignatedInitExpr *Expr) {
+    for (const auto &Designator : Expr->designators()) {
+      if (!Designator.isFieldDesignator())
+        continue;
+      auto *FieldDecl = Designator.getFieldDecl();
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EugeneZelenko wrote:

Please do not use `auto` unless type is explicitly stated in same statement or iterator. Should be also `const`.

https://github.com/llvm/llvm-project/pull/86976